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Does anybody have maintenance experience with Trane's highest efficiency R-123 chillers? I'm on a new construction project where the client has one option of going with a slightly reduced chiller efficiency, or a "best" chiller efficiency which has different (possibly more) condenser and evaporator tubes, which unfortunately also causes a higher pressure drop across the condenser and evap. Preliminary calcs have shown both options would be about equal operating cost (the lower efficiency unit has lower pumping costs...). Any advice here? Thanks..